What is the correct formula to convert feet of head to psi?

The correct formula to convert feet of head to psi is achieved by multiplying the height in feet by the factor 0.433. This conversion is based on the relationship between the pressure exerted by a column of liquid and its height.

Specifically, 1 foot of head corresponds to approximately 0.433 psi in a static fluid under the influence of gravity. Therefore, to determine the pressure in psi for a given height in feet, you multiply that height by 0.433. This factor accounts for the density of water (approximately 62.4 lbs/ft³) and the acceleration due to gravity.

In practical terms, this formula allows engineers and designers to easily convert measurements of water column height into pressure units, which is commonly needed when analyzing and designing plumbing systems.